perfidus

Latin

Etymology

From per (“through, along”) + fidēs (“faith; trust”).

Pronunciation
  • (Classical) IPA(key): /ˈper.fi.dus/, [ˈpɛr.fɪ.dʊs]

Adjective

perfidus (feminine perfida, neuter perfidum); first/second declension

  1. That breaks his promise; faithless, false, dishonest, treacherous, perfidious, deceitful.
  2. (by extension) Treacherous, unsafe, dangerous.

Inflection

First/second declension.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
Nominative perfidus perfida perfidum perfidī perfidae perfida
Genitive perfidī perfidae perfidī perfidōrum perfidārum perfidōrum
Dative perfidō perfidō perfidīs
Accusative perfidum perfidam perfidum perfidōs perfidās perfida
Ablative perfidō perfidā perfidō perfidīs
Vocative perfide perfida perfidum perfidī perfidae perfida

Antonyms

Derived terms

Descendants

References
  • perfidus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • perfidus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • perfidus in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français, Hachette
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